**comp.graphics.algorithms**

## Subject: **Re: method of separating angles?**

news:1148791680.331813.117780@j73g2000cwa.googlegroups.com...

> Can you imagine a scenario that some people are still in the process of

> learning? You're saying that people who are in that process are not

> allowed to post here, is that right?

> If you don't want to answer questions, then just don't. No one is

> forcing you to explain anything.

I believe the negativity of the post started with my response

to Nils comment about rocket scientists, not in my response

to your initial post. My apologies.

I did answer your question, including a link to a document

on the topic and two book references. If you have difficulties

understanding the online document, then the real answer is to

work on improving your mathematical skills. Even if you

understand the mathematics of this topic, you then have to

deal with the usual curse of floating-point arithmetic in

computational geometry problems. Yet another topic to learn

about.

My comments about improving "poor math skills" were

intended as part of the "answer". The posts I had referred

to sometimes go down the path of the OP insisting that

the only barrier to his learning is that the "answers" people

post are not written well in a simple enough manner to

convey the information. The flawed assumption is that

there *is* a simple enough description. If it were simply

a matter of saying the right words to convey the content,

we would be teaching Calculus in kindergarten :)

> The difference is I guess that with a jumbo jet, you can crash into

> some buildings and all....

> ... This means that you have to be skilled before you can get in.

Great! You understood my point :)

You asked about collision detection. The topic has roots in

robotics. I can imagine situations that involve building a

physical system that relies on accurate computations by the

collision detection system and, if those computations are

inaccurate or if an algorithm is incorrectly implemented, the

results are potentially catastrophic. Actually, one of my

subcontractors works in the area of robotics and has worked

on robotics projects such as automatic polishing of fighter jet

canopies and on transcranial magnetic stimulation.

http://www.bizjournals.com/sanantonio/stories/2005/08/22/story2.html

These are areas in which you have to do it right...

Like most folks these days, perhaps you want to do this

for a computer game application. Sure, no severe

consequences in such applications if the collision detection

is not correct or accurate. Some of us have gotten used to

games in which various portions of character anatomy are

sticking through walls :) Regardless, having good math

skills is a prerequisite for working on topics such as collision

detection and physical simulation.

--

Dave Eberly

http://www.geometrictools.com

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